PHP中key和current,next的联合运用实例分析

$arrq = array();
$arrq['tuc'] = array('sss'=>'ewq','shu'=>'sjkah','saa'=>'dwjhaz');
$arrq['tucs'] = array('ssss'=>'ewsq','sQhu'=>dwjhaz','sa12a'=>'dwjQhaz');
$arrq['tuca'] = array('sssd'=>'ewqq','shu2'=>'sjkah','saSa'=>'dwjhhaz');

<?php
$arrq = array();
$arrq['tuc'] = array('sss'=>'ewq','shu'=>'sjkah','saa'=>'dwjhaz');
$arrq['tucs'] = array('ssss'=>'ewsq','sQhu'=>'dwjhaz','sa12a'=>'dwjQhaz');
$arrq['tuca'] = array('sssd'=>'ewqq','shu2'=>'sjkah','saSa'=>'dwjhhaz');
$last=array(); //设置一个空的用来比较的数组
while($arr=current($arrq)) {
  //echo key($arrq);
  $tmp=array_unique($arr); //先清除每个一维数组自身相同的值
  if(count($last)==0) {
    $last=array_merge($last,$arr); //将已经去重的前面的数组合并
  }
  else { // 对其余一维数组进行输出
    //echo key($arrq);
    foreach($arr as $ke=>$va) {
      if(in_array($arr[$ke], $last)) //如果已经存在的元素
      unset($arrq[key($arrq)][$ke]); //删除，此处取得数组元素的KEY值是关键
    }
    $last=array_merge($last,$arr); //将$last变为前面数组的合集，用来进行下次比较
  }
  next($arrq); //指针向后移，这样才能用key函数取得不同的$arrq的下标
}
//以下输出处理后的数组
foreach($arrq as $arr) {
  foreach($arr as $val) {
    echo $val." ";
  }
  echo "<br>";
}
?>